Emery ring



n. F. McGOVERN.

EMERYRING. APPLICATION FILED FEB. 26, 1920.

Patented May 23,1922.

Jazz 5e] [77 6217261?! DANIEL FREDERICK MCGOVERN, 0F MONTFELIER, VERMONT.

EMERY Lame.

Application filed February 26. 1920.

T 0 all whom it may concern Be it known that I, DANIEL F. MoGovnRN, a citizen of the United States, residing Montpelier, county of Vvashington, State of Vermont, have invented certain new and useful Improvements in Emery Rings, of which the following is a specification.

The structure and operation of rings in accordance with my invention will be more fully set forth and described in the accompanying description. In the drawings I have shown as an illustrative embodiment an emery ring which has been found to have the qualities set forth as desirable n practical service. Throughout the speclticatlon and drawings like reference numerals are employed to indicate corresponding parts, and in the drawings:

Fig. I is a plan view of an emery ring in accordance with my invention.

Fig. II a sect-ion on the line II-II, Fig. I.

Fig. III a section on the line III-III, Fig. I, and

Fig. IV a transverse section on the line IV-IV of the same figure.

In forming my ring I provide concentric ring members 11 each having its inner face undercut or bevelled and its outer face substantially straight. The degree of undercut may be somewhat varied but on a ring of thickness I find a fourth inch undercut of maximum efficiency.

These rings are united by a web 2 in which are tapped holes 3 for bolting on the yoke with its driving joint. The web 2 is made with a low transverse curvature 3 and an end taper a so as to carefully avoid any abrupt shoulders or vertical surfaces. By thus forming these parts I am able to avoid a great deal of the throwing efiect of the wheel on the abrasive.

In operation the abrasive is fed to the wheel in the usual manner by scooping it into the central opening 4' of the rings. As the ring is rotated and moved over the surface of the stone, the material works naturally under the undercut face 1 of each of the rings. being thus brought into working contact with the surface of the stone in a uniform manner and with a very even distribution. The slight overhang of the face Specification of Letters Patent.

Patented May 23, race.

Serial No. 361391.

1. also tends to check the peripheral throwing tendency of the outer face of the ring next within, thus avoiding the escape of the material over the top of the rings and preventing the undesirable throwing of the abrasive from the bed.

This invention relates to emery rings and particularly to certain improvements by which the efficiency of the ring is increased and its operation made more satisfactory both as regards the work produced and its manner of action while being fed.

After many years of experiments and after various departures, of more or less radical nature, the old fashioned concentric type of emery ring is still standard.

The only difliculty with this type of ring was that on account of its concentricity it did not work with as much rapidity as was desired. Furthermore, the ordinary ring threw the abrasive badly while it was being fed.

Rings in accordance with my invention have a considerably increased working speed and take the abrasive easily in feeding, thus decreasing both the labor of handling the ring and the waste of abrasive.

My new rings while simple in construction and produced without any marked increase in cost, have a very greatly increased efficiency over the old rings and are much more satisfactory to operate.

Various modifications may be made in the degree of undercut in the rings, and the number of circular flanges may obviously be varied in the rings to meet different requirements of operation, all such modifications are to be construed as to be in accordance with my invention if within the limits of the appended claims.

IVhat I therefore claim and desire to secure by Letters'Patent is:

1. In an emery ring, a plurality of spaced open top concentric ring sections, each ring section having its inner face continuously undercut to assist the abrasive to work peripherally outwardly under the ring sections, and the overhang of each undercut face tending to check the peripheral throwing tendency of the outer face of the ring section next within.

2. In an emery ring, a plurality of spaced ing tendency of the outer face of the ring open top concentric ring sections, each ring section next Within. 10 section having a substantially vertical outer In testimony whereof I affix my signature face and an inclined undercut inner face, in presence of two Witnesses.

saicl undercutsassisting the abrasive to Work DANIEL F BERICK McG VERN. peripherally outwardly under the ring sec- W1tnesses: tions, and the overhang of each undercut R. R. PIERCE,

face tending to check the peripheral throw-' GRAoE JAooBs. 

